A method for manufacturing an electrical device that includes: anodizing a portion of an anodizable metal layer so as to obtain an anodic porous oxide region and an anodizable metal region adjoining the anodic porous oxide region, the anodic porous oxide region being thicker than the anodizable metal region; depositing a layer of liner material on the anodic porous oxide region and on the anodizable metal region; depositing a layer of filler material on the layer of liner material to obtain a stacked structure having a top surface; planarizing the stacked structure from a top surface thereof until reaching the layer of the liner material, so as to expose a portion of liner material located above at least a portion of the anodic porous oxide region; and removing the exposed portion of liner material.